A diffusion-based microfluidic T-sensor with three inlets in which various species are injected was simulated numerically. The results show that the Reynolds number, the dimension, and shape of the micro-channel of the T-sensor, play an important role in the diffusion of flow. The smaller the channel width is, the wider the species diffuse. The inlet angle larger than 45° will not exert any influence on the diffusion. The serpentine channel is a better structure for transverse diffusion and mixing in the micro-channel. These conclusions are helpful for the design and fabrication of micro-fluidic devices as well as the analysis of data collected from such devices.

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